<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        #u1{color: green;}
        .m1{
            color: blue;
        }
        h1,h2{
            background-color: yellow;
        }
        input[type='submit']{ background-color: red;}
        input[type='button']{ color: hotpink}
        *{
            border: 1px solid red;
        }

    </style>
</head>
<body>
<ul>
    <li id="u1">张学友</li>
    <li class="m1">刘德华</li>
    <li>郭富城</li>
</ul>
<h1 class="m1">悟空</h1> <h1>八戒</h1> <h1>唐僧</h1>
<h2 >刘备</h2>
<input type="submit">
<input type="button" value="按钮">
</body>
</html>